i did the outside seam tape with left-over 4 oz glass.

the approach i used was not to try to cut a neat strip in advance. i masked off the final 'strip' on the hull and wet out a 'sloppy-oversized strip' on top of that. when it was semi-cured, i cut it back to the masking tape with a box cutter and removed the masking tape and got a very clean, nice easy-to-sand strip that faired right in.

picture 1: masking off with blue tape where i want the final strip to be
picture 2: oversize piece of scrap 4 oz cloth (leftover from the glassing the deck) wet out on the shear between the blue masking tape
picture 3: after using a boxcuter to cut inside the masking tape lines and pulling off the blue masking tape